Sudoku Challenge is described as 'Free competitive Sudoku platform that goes beyond traditional puzzle play. Features include real-time multiplayer tournaments with live leaderboards and spectator mode, 1v1 duels with Elo-based matchmaking, three daily challenge puzzles with streak' and is a Puzzle Game in the games category. There are more than 25 games similar to Sudoku Challenge for a variety of platforms, including Android, iPad, iPhone, Android Tablet and Windows apps. The best Sudoku Challenge alternative is LibreSudoku, which is both free and Open Source. Other Sudoku Challenge like games are KSudoku, Open Sudoku, Sudoku.best and Gauguin.